dosmythe(at)cox.net
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 Posted: Thu Jun 15, 2006 5:53 am Post subject: Mikuni fuel pump installation position |
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Torgeir,
I must say, this has been on my mind constantly since yesterday. I now
see your theory and must admit, it makes some good sense. However, this
would require a mod to the pump. Like you said, add a new weep hole in the
bottom and plug the old one near the pulse line. Interesting???
There is a test you can run to find leaks in the fuel system. Start a
siphon at the low point and if you see air bubbles, you have a leak
somewhere back up the line. I chased bubbles for about three days before
finding a web site that talked about auto fuel "gassing" off. Anytime auto
fuel passes through a larger surface like a large filter or fuel pump, the
fuel gasses off and it appears that only half the filter (for example) is
full of fuel. I put a mik pump on the end of a clear hose. Put the hose in
the wing tank and started the siphon. No bubbles in the fuel line but
massive bubbles coming out of the pump. Moved the rig over to a plane with
100LL and, NO bubbles anywhere. Hence, one of the advantages of 100LL is
that it doesn't gas off like autofuel and therefore is less prone to vapor
lock.
So, the Mik pump will develop pockets of fuel vapor (maybe not air)
during a gravity drain. I was not able to test the appearance of the vapor
during actual pump operation.
Thanks,
Don Smythe
Become more aware of something everyday.
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